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Agent Sienna made one mistake on the Fanridin run six years ago. Her partner, Kade, never let her forget it.
Now, that past failure has become the fuse for the global apocalypse. Kade-the cold, brilliant architect of the Agency-didn't just betray Sienna; he engineered the worldwide spread of the Crimson Parasite to reset civilization in his image. When Sienna tried to stop him, he left her for dead under tons of concrete.
But the Phoenix doesn't stay buried.
Infected by the Parasite but saved by her unique blood, Sienna rises from the contaminated ground as a scarred hybrid. Her eyes now glow with the cold fire of vengeance, and her body is the only source of the cure. She is the ultimate threat to Kade's regime.
The world is now ruled by the organized terror of the Thick Bloods, and Kade hides in his impenetrable fortress, hoarding the Vaccine-a deadly weapon synthesized from Sienna's own blood and designed to trigger a final, global cull.
To stop the extinction, Sienna must forge a fragile alliance with Ezikiah, a high-ranking Detanas, and Agent Y, the silent, loyal operative who harbors secrets and ignites a slow, dangerous warmth in her frozen heart.
She carries the world's salvation in her veins, and its judgment in her hands. Her mission is simple: break Kade's control, destroy the weapon, and lead an army of monsters against the man she once loved.
The world may be contaminated, but the most dangerous weapon is the one Kade left behind.